I installed a light under the trailer at each corner on the frame extensions. I mounted them to illuminate the area around each jack. I find they come in handy. I also installed reverse lights, which are connected to the trailer pigtail and come on when the TV is in reverse. Both sets of lights are wired to an electrical box with two relays and switches mounted in the front storage bay.
I used incandescent lights for better light output. I did install an amber LED light behind the steps though. I did want that to be dim and not have to worry about changing a bulb due to its mounting location.